/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package org.apache.jmeter.gui;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.HashSet;
import java.util.Set;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTree;
import javax.swing.MenuElement;
import javax.swing.SwingUtilities;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;

import org.apache.jmeter.engine.event.LoopIterationEvent;
import org.apache.jmeter.gui.action.ActionNames;
import org.apache.jmeter.gui.action.ActionRouter;
import org.apache.jmeter.gui.tree.JMeterCellRenderer;
import org.apache.jmeter.gui.tree.JMeterTreeListener;
import org.apache.jmeter.gui.util.JMeterMenuBar;
import org.apache.jmeter.samplers.Remoteable;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.TestListener;
import org.apache.jmeter.threads.JMeterContextService;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.gui.ComponentUtil;

/**
 * The main JMeter frame, containing the menu bar, test tree, and an area for
 * JMeter component GUIs.
 * 
 */
public class MainFrame extends JFrame implements TestListener, Remoteable {

	// This is used to keep track of local (non-remote) tests
	// The name is chosen to be an unlikely host-name
    private static final String LOCAL = "*local*"; // $NON-NLS-1$

    // The default title for the Menu bar
	private static final String DEFAULT_TITLE = 
    	"Apache JMeter ("+JMeterUtils.getJMeterVersion()+")"; // $NON-NLS-1$ $NON-NLS-2$

	/** The menu bar. */
	private JMeterMenuBar menuBar;

	/** The main panel where components display their GUIs. */
	private JScrollPane mainPanel;

	/** The panel where the test tree is shown. */
	private JScrollPane treePanel;

	/** The test tree. */
	private JTree tree;

	/** An image which is displayed when a test is running. */
	private ImageIcon runningIcon = JMeterUtils.getImage("thread.enabled.gif");// $NON-NLS-1$

	/** An image which is displayed when a test is not currently running. */
	private ImageIcon stoppedIcon = JMeterUtils.getImage("thread.disabled.gif");// $NON-NLS-1$

	/** The button used to display the running/stopped image. */
	private JButton runningIndicator;

	/** The x coordinate of the last location where a component was dragged. */
	private int previousDragXLocation = 0;

	/** The y coordinate of the last location where a component was dragged. */
	private int previousDragYLocation = 0;

	/** The set of currently running hosts. */
	private Set hosts = new HashSet();

	/** A message dialog shown while JMeter threads are stopping. */
	private JDialog stoppingMessage;

    private JLabel totalThreads;
    private JLabel activeThreads;
    
	/**
	 * Create a new JMeter frame.
	 * 
	 * @param actionHandler
	 *            this parameter is not used
	 * @param treeModel
	 *            the model for the test tree
	 * @param treeListener
	 *            the listener for the test tree
	 */
	public MainFrame(ActionListener actionHandler, TreeModel treeModel, JMeterTreeListener treeListener) {
		// TODO: actionHandler isn't used -- remove it from the parameter list
		// this.actionHandler = actionHandler;

		// TODO: Make the running indicator its own class instead of a JButton
		runningIndicator = new JButton(stoppedIcon);
		runningIndicator.setMargin(new Insets(0, 0, 0, 0));
		runningIndicator.setBorder(BorderFactory.createEmptyBorder());

        totalThreads = new JLabel("0"); // $NON-NLS-1$
        activeThreads = new JLabel("0"); // $NON-NLS-1$
        
		tree = makeTree(treeModel, treeListener);

		GuiPackage.getInstance().setMainFrame(this);
		init();

		setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
	}

	/**
	 * Default constructor for the JMeter frame. This constructor will not
	 * properly initialize the tree, so don't use it.
	 * 
	 * @deprecated Do not use - only needed for JUnit tests
	 */
	public MainFrame() {
	}

	// MenuBar related methods
	// TODO: Do we really need to have all these menubar methods duplicated
	// here? Perhaps we can make the menu bar accessible through GuiPackage?

	/**
	 * Specify whether or not the File|Load menu item should be enabled.
	 * 
	 * @param enabled
	 *            true if the menu item should be enabled, false otherwise
	 */
	public void setFileLoadEnabled(boolean enabled) {
		menuBar.setFileLoadEnabled(enabled);
	}

	/**
	 * Specify whether or not the File|Save menu item should be enabled.
	 * 
	 * @param enabled
	 *            true if the menu item should be enabled, false otherwise
	 */
	public void setFileSaveEnabled(boolean enabled) {
		menuBar.setFileSaveEnabled(enabled);
	}

	/**
	 * Specify whether or not the File|Revert item should be enabled.
	 * 
	 * @param enabled
	 *            true if the menu item should be enabled, false otherwise
	 */
    public void setFileRevertEnabled(boolean enabled) {
		menuBar.setFileRevertEnabled(enabled);
	}

    /**
     * Specify the project file that was just loaded
     * 
     * @param file - the full path to the file that was loaded
     */
    public void setProjectFileLoaded(String file) {
        menuBar.setProjectFileLoaded(file);
    }
    
	/**
	 * Set the menu that should be used for the Edit menu.
	 * 
	 * @param menu
	 *            the new Edit menu
	 */
	public void setEditMenu(JPopupMenu menu) {
		menuBar.setEditMenu(menu);
	}

	/**
	 * Specify whether or not the Edit menu item should be enabled.
	 * 
	 * @param enabled
	 *            true if the menu item should be enabled, false otherwise
	 */
	public void setEditEnabled(boolean enabled) {
		menuBar.setEditEnabled(enabled);
	}

	/**
	 * Set the menu that should be used for the Edit|Add menu.
	 * 
	 * @param menu
	 *            the new Edit|Add menu
	 */
	public void setEditAddMenu(JMenu menu) {
		menuBar.setEditAddMenu(menu);
	}

	/**
	 * Specify whether or not the Edit|Add menu item should be enabled.
	 * 
	 * @param enabled
	 *            true if the menu item should be enabled, false otherwise
	 */
	public void setEditAddEnabled(boolean enabled) {
		menuBar.setEditAddEnabled(enabled);
	}

	/**
	 * Specify whether or not the Edit|Remove menu item should be enabled.
	 * 
	 * @param enabled
	 *            true if the menu item should be enabled, false otherwise
	 */
	public void setEditRemoveEnabled(boolean enabled) {
		menuBar.setEditRemoveEnabled(enabled);
	}

	/**
	 * Close the currently selected menu.
	 */
	public void closeMenu() {
		if (menuBar.isSelected()) {
			MenuElement[] menuElement = menuBar.getSubElements();
			if (menuElement != null) {
				for (int i = 0; i < menuElement.length; i++) {
					JMenu menu = (JMenu) menuElement[i];
					if (menu.isSelected()) {
						menu.setPopupMenuVisible(false);
						menu.setSelected(false);
						break;
					}
				}
			}
		}
	}

	/**
	 * Show a dialog indicating that JMeter threads are stopping on a particular
	 * host.
	 * 
	 * @param host
	 *            the host where JMeter threads are stopping
	 */
	public void showStoppingMessage(String host) {
		stoppingMessage = new JDialog(this, JMeterUtils.getResString("stopping_test_title"), true); //$NON-NLS-1$
		JLabel stopLabel = new JLabel(JMeterUtils.getResString("stopping_test") + ": " + host); //$NON-NLS-1$$NON-NLS-2$
		stopLabel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
		stoppingMessage.getContentPane().add(stopLabel);
		stoppingMessage.pack();
		ComponentUtil.centerComponentInComponent(this, stoppingMessage);
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				if (stoppingMessage != null) {// TODO - how can this be null?
					stoppingMessage.show();
				}
			}
		});
	}

    public void updateCounts() {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                activeThreads.setText(Integer.toString(JMeterContextService.getNumberOfThreads()));
                totalThreads.setText(Integer.toString(JMeterContextService.getTotalThreads()));
            }
        });
    }

	public void setMainPanel(JComponent comp) {
		mainPanel.setViewportView(comp);
	}

	public JTree getTree() {
		return tree;
	}

	// TestListener implementation

	/**
	 * Called when a test is started on the local system. This implementation
	 * sets the running indicator and ensures that the menubar is enabled and in
	 * the running state.
	 */
	public void testStarted() {
		testStarted(LOCAL);
		menuBar.setEnabled(true);
	}

	/**
	 * Called when a test is started on a specific host. This implementation
	 * sets the running indicator and ensures that the menubar is in the running
	 * state.
	 * 
	 * @param host
	 *            the host where the test is starting
	 */
	public void testStarted(String host) {
		hosts.add(host);
		runningIndicator.setIcon(runningIcon);
        activeThreads.setText("0"); // $NON-NLS-1$
        totalThreads.setText("0"); // $NON-NLS-1$
		menuBar.setRunning(true, host);
	}

	/**
	 * Called when a test is ended on the local system. This implementation
	 * disables the menubar, stops the running indicator, and closes the
	 * stopping message dialog.
	 */
	public void testEnded() {
		testEnded(LOCAL);
		menuBar.setEnabled(false);
	}

	/**
	 * Called when a test is ended on the remote system. This implementation
	 * stops the running indicator and closes the stopping message dialog.
	 * 
	 * @param host
	 *            the host where the test is ending
	 */
	public void testEnded(String host) {
		hosts.remove(host);
		if (hosts.size() == 0) {
			runningIndicator.setIcon(stoppedIcon);
			JMeterContextService.endTest();
		}
		menuBar.setRunning(false, host);
		if (stoppingMessage != null) {
			stoppingMessage.dispose();
			stoppingMessage = null;
		}
        activeThreads.setText("0");
        totalThreads.setText("0");
	}

	/* Implements TestListener#testIterationStart(LoopIterationEvent) */
	public void testIterationStart(LoopIterationEvent event) {
	}

	/**
	 * Create the GUI components and layout.
	 */
	private void init() {
		menuBar = new JMeterMenuBar();
		setJMenuBar(menuBar);

		JPanel all = new JPanel(new BorderLayout());
		all.add(createToolBar(), BorderLayout.NORTH);

		JSplitPane treeAndMain = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);

		treePanel = createTreePanel();
		treeAndMain.setLeftComponent(treePanel);

		mainPanel = createMainPanel();
		treeAndMain.setRightComponent(mainPanel);

		treeAndMain.setResizeWeight(.2);
		treeAndMain.setContinuousLayout(true);
		all.add(treeAndMain, BorderLayout.CENTER);

		getContentPane().add(all);

		tree.setSelectionRow(1);
		addWindowListener(new WindowHappenings());
		
		setTitle(DEFAULT_TITLE);
		setIconImage(JMeterUtils.getImage("jmeter.jpg").getImage());// $NON-NLS-1$
	}

	public void setExtendedFrameTitle(String fname) {
		// file New operation may set to null, so just return app name
		if (fname == null) {
			setTitle(DEFAULT_TITLE);
			return;
		}

		// allow for windows / chars in filename
		String temp = fname.replace('\\', '/'); // $NON-NLS-1$ // $NON-NLS-2$
		String simpleName = temp.substring(temp.lastIndexOf("/") + 1);// $NON-NLS-1$
		setTitle(simpleName + " (" + fname + ") - " + DEFAULT_TITLE); // $NON-NLS-1$ // $NON-NLS-2$
	}

	/**
	 * Create the JMeter tool bar pane containing the running indicator.
	 * 
	 * @return a panel containing the running indicator
	 */
	private Component createToolBar() {
		Box toolPanel = new Box(BoxLayout.X_AXIS);
		toolPanel.add(Box.createRigidArea(new Dimension(10, 15)));
		toolPanel.add(Box.createGlue());
        toolPanel.add(activeThreads);
        toolPanel.add(new JLabel(" / "));
        toolPanel.add(totalThreads);
        toolPanel.add(Box.createRigidArea(new Dimension(10, 15)));
        toolPanel.add(runningIndicator);
		return toolPanel;
	}

	/**
	 * Create the panel where the GUI representation of the test tree is
	 * displayed. The tree should already be created before calling this method.
	 * 
	 * @return a scroll pane containing the test tree GUI
	 */
	private JScrollPane createTreePanel() {
		JScrollPane treeP = new JScrollPane(tree);
		treeP.setMinimumSize(new Dimension(100, 0));
		return treeP;
	}

	/**
	 * Create the main panel where components can display their GUIs.
	 * 
	 * @return the main scroll pane
	 */
	private JScrollPane createMainPanel() {
		return new JScrollPane();
	}

	/**
	 * Create and initialize the GUI representation of the test tree.
	 * 
	 * @param treeModel
	 *            the test tree model
	 * @param treeListener
	 *            the test tree listener
	 * 
	 * @return the initialized test tree GUI
	 */
	private JTree makeTree(TreeModel treeModel, JMeterTreeListener treeListener) {
		JTree treevar = new JTree(treeModel) {
			public String getToolTipText(MouseEvent event) {
				TreePath path = this.getPathForLocation(event.getX(), event.getY());
				if (path != null) {
					Object treeNode = path.getLastPathComponent();
					if (treeNode instanceof DefaultMutableTreeNode) {
						Object testElement = ((DefaultMutableTreeNode) treeNode).getUserObject();
						if (testElement instanceof TestElement) {
							String comment = ((TestElement) testElement).getComment();
							if (comment != null && comment.length() > 0) {
								return comment;
								}
							}
						}
					}
				return null;
				}
			};
       	treevar.setToolTipText("");
		treevar.setCellRenderer(getCellRenderer());
		treevar.setRootVisible(false);
		treevar.setShowsRootHandles(true);

		treeListener.setJTree(treevar);
		treevar.addTreeSelectionListener(treeListener);
		treevar.addMouseListener(treeListener);
		treevar.addMouseMotionListener(treeListener);
		treevar.addKeyListener(treeListener);

		return treevar;
	}

	/**
	 * Create the tree cell renderer used to draw the nodes in the test tree.
	 * 
	 * @return a renderer to draw the test tree nodes
	 */
	private TreeCellRenderer getCellRenderer() {
		DefaultTreeCellRenderer rend = new JMeterCellRenderer();
		rend.setFont(new Font("Dialog", Font.PLAIN, 11));
		return rend;
	}

	/**
	 * Repaint pieces of the GUI as needed while dragging. This method should
	 * only be called from the Swing event thread.
	 * 
	 * @param dragIcon
	 *            the component being dragged
	 * @param x
	 *            the current mouse x coordinate
	 * @param y
	 *            the current mouse y coordinate
	 */
	public void drawDraggedComponent(Component dragIcon, int x, int y) {
		Dimension size = dragIcon.getPreferredSize();
		treePanel.paintImmediately(previousDragXLocation, previousDragYLocation, size.width, size.height);
		this.getLayeredPane().setLayer(dragIcon, 400);
		SwingUtilities.paintComponent(treePanel.getGraphics(), dragIcon, treePanel, x, y, size.width, size.height);
		previousDragXLocation = x;
		previousDragYLocation = y;
	}

	/**
	 * A window adapter used to detect when the main JMeter frame is being
	 * closed.
	 */
	private static class WindowHappenings extends WindowAdapter {
		/**
		 * Called when the main JMeter frame is being closed. Sends a
		 * notification so that JMeter can react appropriately.
		 * 
		 * @param event
		 *            the WindowEvent to handle
		 */
		public void windowClosing(WindowEvent event) {
			ActionRouter.getInstance().actionPerformed(new ActionEvent(this, event.getID(), ActionNames.EXIT));
		}
	}
}
